[Test] Merge box against java tests into codegen black box tests

compiler/testData/codegen/boxAgainstJava/oldLanguageVersions/ieee754/explicitEqualsCallNull.kt

@@ -1,6 +1,7 @@
 // !LANGUAGE: -ThrowNpeOnExplicitEqualsForBoxedNull
 // IGNORE_BACKEND: JVM_IR
 // ^ ThrowNpeOnExplicitEqualsForBoxedNull is introduced in 1.2.
+// MODULE: lib
 // FILE: JavaClass.java
 
 public class JavaClass {
@@ -20,6 +21,7 @@ public class JavaClass {
 }
 
 
+// MODULE: main(lib)
 // FILE: b.kt
 
 fun box(): String {